Apply balanced fertiliser to encourage further blooms in early summer.
There are many fertilisers available, all applied in different ways, for different purposes. Fertilisers are either carbon based (organic) or man-made chemicals (inorganic). Organic fertilisers include products made from dead animals (eg fish, blood and bone) or plants (eg seaweed meal). Rock potash, a naturally occurring mineral, although some organic gardeners prefer to avoid it.